Question

What was the main drawback of Mendeleev's periodic table?

• A. Many elements have several isotopes.
• B. Noble gases do not form compounds.
• C. Some groups stand divided into two sub groups $A$ and $B$ .
• D. Atomic weights of elements are not always whole numbers.

Answer 1

Answer: (A)

Mendeleev's arranged all the known elements in increasing order of their atomic masses and gave the periodic law.

According to Mendeleev's Periodic law, The physical and chemical properties of the elements are the periodic function of their atomic masses.

Mendeleev designed a periodic table and arranged all the elements in increasing order of their atomic masses but not included the isotpes. As isotopes also have the different atomic masses. It is the major limitation of the Mendeleev's periodic table.